put sane base dir into distribution zip, so it doesn't stomp over whe…

…rever it's unziped

build.gradle

@@ -11,26 +11,30 @@ task dist(type: Zip, dependsOn: [':sham:javadoc', ':sham:jar', 'doc/guide:compil
     def shamProject = project(':sham')
     def docProject = project(':doc/guide')
     archiveName = "$buildDir/sham-${shamProject.version}.zip"
+    def archiveBaseDir = "sham-${shamProject.version}"
 
     from(projectDir) {
         include "LICENSE"
+        into archiveBaseDir
     }
     from(new File(projectDir, 'doc/dist')) {
         include "README.TXT"
+        into archiveBaseDir
     }
     from(new File(shamProject.buildDir, 'libs')) {
         include "sham-${shamProject.version}.jar"
+        into archiveBaseDir
     }
     from(new File(shamProject.projectDir, 'src/main')) {
         include '**/*'
-        into 'src'
+        into "$archiveBaseDir/src"
     }
     from(new File(shamProject.buildDir, 'docs/javadoc')) {
         include '**/*'
-        into 'doc/api'
+        into "$archiveBaseDir/doc/api"
     }
     from(new File(docProject.buildDir, "manual-compiled")) {
         include '**/*'
-        into "doc/guide"
+        into "$archiveBaseDir/doc/guide"
     }
 }